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8251543: add mention of INFLATING() to share/oops/markWord.hpp header comment

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Reviewed-by: kbarrett
This commit is contained in:
Daniel D. Daugherty 2020-08-15 16:02:29 -04:00
parent 8d432d29b8
commit 50c37fc749
1 changed files with 5 additions and 1 deletions
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6
src/hotspot/share/oops/markWord.hpp
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@ -86,6 +86,10 @@
// [ptr | 11] marked used to mark an object // [ptr | 11] marked used to mark an object
// //
// We assume that stack/thread pointers have the lowest two bits cleared. // We assume that stack/thread pointers have the lowest two bits cleared.
//
// - INFLATING() is a distinguished markword value that is used when
// inflating an existing stack-lock into an ObjectMonitor. See below
// for is_being_inflated() and INFLATING().
class BasicLock; class BasicLock;
class ObjectMonitor; class ObjectMonitor;
@ -226,7 +230,7 @@ class markWord {
bool is_being_inflated() const { return (value() == 0); } bool is_being_inflated() const { return (value() == 0); }
// Distinguished markword value - used when inflating over // Distinguished markword value - used when inflating over
// an existing stacklock. 0 indicates the markword is "BUSY". // an existing stack-lock. 0 indicates the markword is "BUSY".
// Lockword mutators that use a LD...CAS idiom should always // Lockword mutators that use a LD...CAS idiom should always
// check for and avoid overwriting a 0 value installed by some // check for and avoid overwriting a 0 value installed by some
// other thread. (They should spin or block instead. The 0 value // other thread. (They should spin or block instead. The 0 value